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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57405028d2190137f89fdffcd145e4a8bbf3bdf9007e9612c19a753f0cae662c' 
  AND token = 'TxHFlbOtiO9tHWxJFmoVyzb3wxTiv3gTc2z3jkmZCck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

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