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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08446f8eea8bfc538647fd03bfb9e43503aa2ce3391c5b0c15cb16baa9f2d1d' 
  AND token = 'iOS85LAwN6cpMIhfi4DuqEBbfpxRiREtw9OLDWjzkew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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