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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d00a5131109e63966634d44d1bb2dd448be1450db031db797b754d19fd34086' 
  AND token = 'vdpOf9RncbN0K77hPBgb5P7ky4uJ80/cuByXRscgt+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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