godot/editor/icons/KeyEasedSelected.svg

<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><rect width="10" height="10" fill="#5fb2ff" rx="1"/><rect width="5.6" height="5.6" x="2.1" y="2.1" fill="#003e7a" rx=".5"/></svg>