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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ce52e29f211cb76f2c0056d055c086137431745d75930d5036617b4dd43607' 
  AND token = 'hoADahBA8HkfSLicC29JS8vg2UoK7lUahS4dIE4XJdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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