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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf85a1e19bcd1badceb8aef78cb014d361fb26ad619c1718fd21e2c0209f0950' 
  AND token = '7LI73d0CqprYCdNNyjWruGghYwCcEgedFhLaYa37iJ4=' 
  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