SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178d52e4ce45a27306a579d5dfb5b924ad65bc4827df5dc25ab7eef73184b5fe' 
  AND token = 'ou9CVeoLFpzjQfx+PpW7kmUn1BQBzK/O23D1UZtsY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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