SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd61df59d6f69df47fa278e4a49939163bcaf6b669d1e8368b84e410e95725c' 
  AND token = 'bnDOIC5qFBW7GVO75wjTcY/yLxXNgamJytQocz8Zkeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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