SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e5a68e2380c1ace8d4032f24fc597859844e28956f2020ebeb314e81df46d8' 
  AND token = '95FY5u7fn9PH0CJgBbBj87ckG9lmTYUNSZ2QVxVhMZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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