SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6ed11939efd20171dffd62e51e837f7b39504f3fe39b15c44a327d39a4dd70' 
  AND token = 'SdI47+872ZAPdpQ06qH1Q3x1LOYUfpfHETR4VfWX2kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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