SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33235ed28391895771b83535a50b8e962886eec5bee08f7bbac52a9a94bab516' 
  AND token = 'GKhtq8hhMOgANrIPIwQHUz2DgJTq4Y9X2MRjfy2sUfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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