SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a2d07cd03380cf847d42f225528b8d5f1d95939ae4f8480bbb33f2f0ca93e3' 
  AND token = 'f+CqR2CZLI7JaPPNkvowDXEKGzUNE7/eAXjjl1rHJTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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