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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8264a6aed24ddb8a19c27cf37f13aa0acc842c86dc657ecd9ed0e160f3486721' 
  AND token = 'hMLkRY1P/hz/HigV8NTM5ZNXtOJ1X0Yp8iO4WsuUsJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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