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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4b07889c1c4a49ebac3b18d23dc7711320ac6c18707ecb0a54b7318311ef29' 
  AND token = '9Z6AVvjbUfb4YSKZVjd0dacwYc7notUHZc5jp6pHgFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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