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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d57f5c104441ace4605043e2a20ea0b459ab092862bea36c65bb2ad1472e9ce' 
  AND token = '238Sy3HkhJtPAfvYqSc8LYW4J9lPL3j8/I8YUAaQYek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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