Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4ce0375604faa1701eaecf4d5972eacbed3f41e140ef3ee347afedd0dde623' 
  AND token = 'L/zA6p4hxJ+9iHjoEVzxeq3RWbz+GelbMh/YwhX4AT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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