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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e71075592117d6f78145d183a366e596bd7874480c0ee7ac94ec3137f9470d' 
  AND token = 'GFiXnyFAqibaWlr3KmQtnOlL8ewm0gVlWWIAfV7FvkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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