Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800d9f49f7d9633400d8e14d0ef2b34ae8b7a0dd50f58559f119145943c9eb03' 
  AND token = 'cRz3CNIE//cd1Hc8EcXpYx1fzfZ3dHePPP3KXTzFCzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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