Located a few blocks east of the buzz of Time Square, the Lantern's Keep is the name of the elegant new bar at the Iroquois, a hip boutique hotel. It's easy to miss this place, as there's no indication of its existence at street level, but once you've found it, you'll encounter a cozy cocktail'salon' (their term), a haven from the outside grind. Taking as its inspiration the Parisian salons of the…