SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa7d9a92b3883e634d8ff6eccef85b63791d3c7f7f82f4cf188dd0c4a24e049' 
  AND token = 'ikr+UZqSUsQNyegiPBlAmqrVFY5izIiUXLODQv7eFDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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