SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089510b32dbdda27d70c6d1fd275bf94a9e1fd697b52c9dac3400bf862980ae3' 
  AND token = 'rJaGg12d3SoWmmSXF+ZF6pmw/6zrBYS8w/+5VUXO+iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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