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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57c408df2f16db56f4a979ea91ebb8d6caf82d7d55a693732de2ca71dbc0a5f' 
  AND token = 'jVvZijvwzDJOdoFxAi7o6c0e6K2SSDnUMqFYh84Z0lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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