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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a4d2e2ad15b58ea66f29b9cdbc12b7e969dc531a4ae9c5f568ef8624b9902e' 
  AND token = 'KRUPJGjRc3qrt60qIr8VGGBlntbzV8Vt9tTDlZnlW/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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