There is one species of tomato that lives only in the high Atacama desert. I'd say it meets your criteria of being drought tolerant. Of course, it is not an edible variety so nobody is going out of their way to grow it except for breeding purposes.

Varieties with larger root systems tend to survive drought conditions better than average. Also, grafted plants on top of very vigorous rootstocks such as Maxifort are more drought tolerant.

I found that bountiful gardens is listing three in their "drought resistant" category. Stupice is one.

Celebrity has shown much more tolerance of low water conditions than most other tomatoes I've grown outdoors. The fruit is not huge, but makes reasonable slices. I find that the fruit is not as sweet as some other tomatoes. I've allowed the plant to sprawl on the ground, and this also does seem to help with the low water conditions: fewer of the leaves are exposed. Stupice might be considered a low water variety also by some, but you may find that you need to deal with some blossom end rot if you don't provide more water. For me, BER is not too big a deal; I can just cut off the affected portion. The other hint for Stupice would be to plant the transplant really deep in the ground when you transplant so that there are lots of roots at different levels in the soil. Stupice is not a super vigorous variety so you may not need to prune or train, and the compact growth probably does protect the plant from too much moisture loss.
Renais

Thanks for that info, Renais!