SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde9f0702fca587f471b29aec7475f48db8894503b01280312b79f38c1b172f3' 
  AND token = 'PBFRBLUj9QqJetYd/C+W9gFHTBwyrPwCaI0RajYSuDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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