SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ef6a32c1f35dfccc4ab3361ffeefbe8a6ac3b8407bb870cdbc890579c2d022' 
  AND token = 'HZMZ8+mQzRYwXIVH7XZmu88ouoo/rnkUqop7L2AlyBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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