Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31729ed63cd5e43bb389f69788dd808de3f96f26a58caeef2f5d0ce36da515c' 
  AND token = 'eyaCEaiDKhA8B7p5IqA9fvOrz89XjCZvKeY3FoMP0yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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