Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb920cb709915ff228b8bad5d59c6955eb6436011ded68e0b85853a8962ca33d' 
  AND token = 'y4YqwozmXRVD7cDyTcq2jMVB35wEbc78SoGH9+4uAlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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