Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4f76b9eda65babceb48a08c0d152cb1c9e7fe1b05abff8ef9cd07a50c3a49d' 
  AND token = 'PbNpri4hAFQjhbuBN2TRBLxYM2cZ69PS3b8+gfys8Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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