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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7a116e5c496bd38a44cabd87cbeca97b81464d0db07b185ad15447e258b66d' 
  AND token = 'fVvoku5rVxym7xJYUMkduKbYLFsr9siHjsSf5lIJjog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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