SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae96380ff2794c78104269a13b9e45de2578496b4ed917936e287cf95c044e8e' 
  AND token = 'HznJ3mgWNFjGMCejVRiqgnZMRoAXp0jhKkRG1KcIjEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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