SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a9740bdbb2568cfb29d641248b64da5d05cdbe2d6db9a4ce4f87f294984503' 
  AND token = 'jEHKFLNfzWiB7XZ3x5mADhXWGIwZilj2vT2ge7XJfTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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