SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9930ace13f214832d8f08f535f4257cebc8308d6829626d251067be735ed453f' 
  AND token = 'ob/R5cIWBLm8yGJ6OAz01BBVqFhSuYBjZ01Ao98dtmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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