Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd352e02e3d4df92cee67793497d7b2e05dbcfe7f3fb1795e35016d050a4061a4' 
  AND token = 'ttjCpmD00WvI29zjUXjFXdPd0WifLeil2Hjqu4ROlzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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