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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbcf9fcbf0d76966c9ca8852572a9d0e522934734a6c103c9f4d0a67cb45a0d' 
  AND token = 'xM85yFNcNjDl25rus5b0mIZjBtO8gPW4ADHhje5onSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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