In theory drive through should be the best possible food mechanism in terms of risk to the workers (and patrons). If they could arrange for contactless payment (already possible, just affix a tap reader to the side of the drive through window), and some way to serve the food while keeping the window closed (a shelf extending out from the window and a policy that they won’t open their window until you close yours?), drive through could be a real solution to pandemic food supply.
Sure as hell beats a bunch of people in the same supermarket breathing all over the produce and right on the cashier.