SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e9069d615bd9ae9bc3598c5d7b5a135f602fa82201a6877b36907560bb4f5d' 
  AND token = 'x4s+eHBcVvuz8TnUDFMOoLVz/xbFgmGPfcd12fhQhnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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