Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3083a365ea3de3439ea3ba4a688c9fe6f90987a26942e18ce2dc488c5016913' 
  AND token = 'PzFa+2wFJ4QQKk+a6GmjyoNlZ6SHOz//gTiN3Bw1fWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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