SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14500276e3bbf98cfb199e3ec7a70348c73a246e4de66023d9a3d170bfe56056' 
  AND token = 'rWDYPbjXtzNgwqdYvt+MBu8CS23FT8oJq9BhXX1UMkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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