SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224e45b377a8f2c1b467f91ed78ddafc6761a05cfff3995c9064bf49cf0303ea' 
  AND token = 'jy58+jOOIsVWG3JA/lZD71AL4bcwzwRHSw1kqwG3AJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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