Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff055dc2a085dae35c22f6da016ea33b3c34ad0d897a828721eb205a3331c4cd' 
  AND token = '+XfzrUHTSI56TR2M3E8wUrTjWpuuBEPH/KdtOfmoqho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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