SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d94687f8efdd516b8c330646e32b7854d9dff3fba2ccbba6b1ffea9289c0949' 
  AND token = 'ouFZhqqGWXMfAptblXbVfjxOClJnEkaydpkrChBzvLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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