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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5b9eb28b31e889f28ae48b78d29a651fa43e42c84154f8764bbf5a2b6b4482' 
  AND token = 'ZrXh03OZIlyTM5lvcjewyKehonOvsk+YDVhLEQMkfEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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