Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e5a4212f631b9d81ca4ecbe7611458ba2229eaef897783beeca9c2138da276' 
  AND token = 'vskA/xpvP7KRe1QjvxLC8nc/fTEcvHhhPVj+les0f6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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