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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29408fca77f7f849938910fe673521c3661606fe050632a603284d2b76ac6945' 
  AND token = 'wKh7gC829IsHggjrrG1lF6wT+i3gtNQy/9eauZvAj+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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