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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94540d0fc0cb96d0733ea7f2fb4e6866ce00b976dc8b9c8ec69b8ac9725a43cf' 
  AND token = '4kWDmJp4zkHfi0DN7I5zF2lvi92+jUMSODBSuOxy5L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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