SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1b33c0641589097c4f9036f0a27738f476ac5a08f78ee246deb3875abd537e' 
  AND token = '/dwlqB5v5GP16SCIahDMmn+wdsJHFhZdxKDv8a2YQEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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