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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac76373dc0d2bedb96bd736aefaf0d18c1f62968ce873cfd8455cbb88e0cded' 
  AND token = 'gaIZFQbyOeEVeE1VTR9O2SBXbTkQtDe4gaANKmjf2Yc=' 
  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