SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2ff5871a534c4ace0c8fb8e25f6983c65b796b8858f89b8cbd0494bc47dc05' 
  AND token = '/LaaHSYDxBdQJw05B/V1mBveqvVTZDaj7Z3VVCfGYe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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