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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28331d70041ed730a2eec1d480a183590bc1444b62ff0fe167f34dee38fe9cde' 
  AND token = 'WzkHw341bm4vI4rV/7CS08Xp4nBl1kDB8Dl1aT36GQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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