Preheat the oven to 350° F. Place the baguette slices on a baking sheet in a single layer. Brush the slices with olive oil. Bake for 10 minutes, edges should be crisp but the middle still soft.
In a small bowl add the salmon, shallot, thyme leaves, chives, lemon juice, and pepper and stir to combine.
On each baguette toast, spread a moderately thin layer of crème fraîche. Top with two overlapping slices of cucumber, and a small spoonful of the smoked salmon mixture. Garnish with lemon zest.