Preheat your oven to 350°F (175°C).
In a mixing bowl, whisk together sugar and flour.
Add eggs, lemon juice, lemon zest, melted butter, and salt to the mixture.
Blend until smooth and well combined.
Pour the lemon filling into the prepared pie crust.
Bake in the preheated oven for 25 minutes, or until the filling is set.
Remove from the oven and let cool completely.
Refrigerate for at least 2 hours before serving.
Garnish with lemon slices and mint leaves if desired.
Slice and enjoy your refreshing lemon pie!