Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9814fc0603389e2d19211d35c248535ea45eb75005bf3451d4c143aa9aee139' 
  AND token = 'lgymyc+aA6GbxDczXMUA6AQ1p6rIRLuOMRh94VvFaBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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