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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d3dcdf8d7c0c2e8f74948e71bdbed216a97b7600737bcdee583cb031b76b72' 
  AND token = '1LZwDD5GjVkXdEIqHyf6fRis5/XW6x0E5WPnvpCFt1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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