SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3dbd68b1b43caeaf4b6d5f0fdce422a0f4810561b0dcf0224250ac4264c955' 
  AND token = 'm1GMU3N83o9VBPU0FmMBKYzw9MK1d5Zf75Wm+9jqa48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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