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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768410f4863da048ca73469b5db3ac5e607e7b471b9c1c50c632565f0f74916d' 
  AND token = 'x4S4xkNqEBX660fFeRexQyFFy1oGLmAfmeKHoWGgyZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables