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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175a996f8f037d64c024ce444899bb4e68d79ae11e773bee1c6e8bec45d4ee13' 
  AND token = 'yfSi9UfbjSZdnkDJGoKfhUq4o7D7fuXvUMorzYHFEro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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