SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a13e8701913b0ff4758bffa3e3a622bb74fac3fcb318f11507ad33dd66c827' 
  AND token = 'OhRWPoXYYBtjLJZvpcmswHnso5OrBokqQXlkcVaqiKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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