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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4653a5fdb4d31ffe223cabbe9b76261f36e1937fc263fffb2aec5f0620f3b6da' 
  AND token = 'FTU+tWzyxCIQEw1cyDWocj2wFiZw8RLq2eTs6J6dFdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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