SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9544023c59b5222f5fc839ff77a8baca4c4032213fe0d81f5e3d9ab54075cc' 
  AND token = 'uDFZoy+b/7BAgYhtbIOMxwh9C/veWXkpqdkzb/gWsWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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