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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ba7bb57be825122841f9b5fda9370cdacf85972b7c9177bd067a28f7107099' 
  AND token = '+yMaiYt7Kll6q9Ka7fCau/SiuFzTOd2u4sVJIcdgUBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}