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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e2c1831b40fa21cdac5a79e3c28d0c45c063d0c25579657f0f42d35f560d39' 
  AND token = 'j6IHxR+r2RmST/935Ye+xFmFg6iN+YKDXwp0sVmIFzI=' 
  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