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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c11c8c7ea516d27eac3fe749955315a2ba9634fc6a9e6a1b2271d713993624' 
  AND token = 'xoLwdqVbz9h5cQ5ctpdEPZiZr7dwWCf2hWhG6eVJAUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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