SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa562417c242816e553627b0ad7f1eaab9b438d1100f891fdc76d1e1d873f84' 
  AND token = 'WGUNwUkhtpC7zLPAMfpHBG/KFzY8tWIN61v6B7Hlg5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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