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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4d0faeb18c11cafa7a600794e7f6be5ea0d69292b3a22ec487a09764a93c56' 
  AND token = 'Q5TIg7h8B572q1mPBhS8PB67mGl6cydCCMp6MzfYRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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