SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5b7c3f1c6611ae3b1fff888c5826942e81a2d8c199fdda1c95cb8bce2465a7' 
  AND token = 'TMSFmYzrwLpeWVphHavhmNLZaW/QBSyU9KVBogMRfg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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