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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342b91a6d09cd9acc9ead0433571041829d3728e36f89e0f542f9fd5489635c7' 
  AND token = 'WgNEutsmr5rBlHoG5TMgoAffBgoZRTSY1mdsZFvVGn4=' 
  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