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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba71033725accd79a8f8e4dcd314a897d3603c077c13d66a3f9465030042513' 
  AND token = 'xd/rUSxxlJ4WtMa3gl39Hj8j0vLkZ/zreq0a48uAATM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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