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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d72984884ac9cc807c24a33784ecfe3c6aa7c19c37536bfece6f2a08c28ac9' 
  AND token = '8/hVOdisviI6nflEKjY1fQRmkbCBZv2UnjcefoO3M0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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