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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c48f567afa84f12b0be9f2fc47c25a3119728db805452e6839f14f01704521' 
  AND token = 'MeKV//j8utp08lHf2xAYLLr3cIH7xcQJ5hBbErdDF4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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