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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5efe96e03253f1541b573e44b51ff670de14ef12b6caeef07556c890e8abea' 
  AND token = 'c0f96x9f/o/XVdZYsp1E6S4ERlREY1Gr94Ueqls12WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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