SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7361e3c02f4160562695e4e35db8b1045ae10e5bc476ec789b2ca888e828c98b' 
  AND token = 'Q0E5CdXRqgLuVhkoNtZt1FT/Hhmz5i8kLP+pHSvpYUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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