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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5566c8adbb008d45415550c69894b6930b0d0784457c8395c21c48139e50af' 
  AND token = 'i7kitzLvskfr0uJBE6eTdTlI5V3H7XUuPFleoJQEBoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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