SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd682754bca16a1a931754c37f165d32a0e9cbfb74ac93311562732e4cff182' 
  AND token = 'CVUjXIWbJGxI001YpLvkgoF+AR9LaPvEWv/leeMF/3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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