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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd5a329ac115b8d6b13ff4a6d2ec556816b639874766a6b48475310d54f80da' 
  AND token = 'euVpCxeBxJYcH9XDRXnHKCa2dx48J8hNnyHSAq3npg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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