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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb44af92c5827cdbd18ce462fa6d40a0773ab8009e4dce98b4dc08eb9280a3f8' 
  AND token = 'Q/58K5mhRmA4s1p2jFLtJU9DLnIp43/X8PREH4uA3KU=' 
  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