SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e10448e73b1f5e32f4a99d39f87af4f2982e61f677e23e8a5132ed9dccdcc6' 
  AND token = 'PBDwfS0P8s7Jb3gIwa4ahdg/5U8rqgvHLGBYVOSryOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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