Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c2559efca8bd108da5c0534789332d93f77d6b196b743a7345e4c899c20cac' 
  AND token = '/imOr7w29XuswgEbTIVGr1IdEDFkSWXzXnJD0UpTpso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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