Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a013f4260a9eb85b1fa07c1ce5e4dcd6b835c6657c26b20b7ae8662ef541c7ad' 
  AND token = 'DXVMtJC9nW3nlMAezXeQlVMjV3mn8gn4xiiqAShR1Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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