SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8779aa0dba0dd49d71318f5cb2111fa45b654bc5589b84504e91cb6dbb38a77c' 
  AND token = '+RdlvhXCGvXY2h2oLO3YBJr3Zof6meFlzPlL4guLf+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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