SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b704410b97447697619c7d3bef0d55c22b28ce18694f964e7323146559b2fe' 
  AND token = 'wUsryWjXfDKhJ9kwPh2z5u64+1MSSmon3GGVI+/9/yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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