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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5c2d04994b1e36d19e61c8361eefa268c5e5f07968f4e655cee8038cc0d7d4' 
  AND token = 'pjlyESrBLpjDkeuOYHlxjbL3MTDd424YC2zr5oKypuI=' 
  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