Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f1b3289f70366552b627633b54899de6c106ed35c1828c728a3d9d6d084631' 
  AND token = 'oRDog1YU9UKPqFB57VAenYG+n9aupZrNZxZukb2s26k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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