Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5096574febd31239560f74452d47020b01e9c4525e6233fe017a1cc3a67246a8' 
  AND token = 'iZ4NhUPSGL95SPnB1mbFaSazMnexNZIehimujR6dJog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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