SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d333bbb40379b1e0307f1fcb8ba3f3b6d816451757a52dcf657ef31bf05b825' 
  AND token = 'cuaiqBAHILKJR0YNSFGsjVhGjhdLmX66NRJ9R+z10xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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