SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ded2d6e144436408452ab74ca6680b5791de8f40669089d56339e42f6ab22f' 
  AND token = 'zhEa+mKlhuNJgS308jFJQsPZMUDDpuFnTYhLpTmzi6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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