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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd1bd47f3595bfb88cbaddf50ce1c15963ed7087959eed53be3986e5f5577b8' 
  AND token = 'cX38BtoWw8MOJrP49OYkYR98wMT2qCfDzs22kKMdF6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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