Preheat your oven to 375°F (190°C).
In a large skillet, heat butter and olive oil over medium heat.
Add the sliced leeks to the skillet and sauté until softened, about 5 minutes.
Stir in the shrimp, thyme, salt, and pepper; cook until shrimp are just pink, approximately 3-4 minutes.
Pour in the white wine and heavy cream. Bring to a gentle simmer.
Remove from heat and set the mixture aside to cool slightly.
Roll out the pie crust and fit it into a 9-inch pie dish.
Transfer the shrimp and leek filling into the crust, spreading it evenly.
Cover with another layer of pie crust and crimp the edges to seal, cutting slits for steam.
Bake in the preheated oven for 25-30 minutes, or until golden brown.
Let the pie cool for 10 minutes before slicing and serving.