SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e29dcca2f09b25c7d5e94cfbd784302755264e181631a7f15ab9a95cc2b8880' 
  AND token = 'E9+Lv7LBuasgRg1hCYOpfNjfGJ92HVKcXo9i+afE/gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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