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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cbc5089a38c715f60f6362172b69e5393c58cc9b77e3e12ff2bd5f5e0bc2c2' 
  AND token = '8c6WOS4wqJNXHi6l9DwuRwfim6zn8FNHHejYusVcuZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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