SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f10a9a44a4a72fa8848bdf5e1a2749959b3204f9d674c2fdb1f16ddb8257d6f' 
  AND token = 'a+Y5KGpKz5j2pME89MXv/PZpyVmAneSxlj/f1GIitLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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