SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00e27c22c17d2ed91579c184964bcb0c15c04f2b36eca6da013d9b5a25c81bc' 
  AND token = 'hBKuuUmvLVgBLlXrqljb5Vri7kBTvx8wTGLXED5upQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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