SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5a592f280fc47c1107b5ecf752740fb514699aec7f1f533585baf861733eda' 
  AND token = 'zHI1QVKDlV6Kbs+5vBV0TpmUrmUqHgkQwhK7P6kVMBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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