SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aae6998e0c8f6da3e7b17ba95fbf7594907eb935e7d010e94c7358e269697d3' 
  AND token = 'CrpYyzuXrwK1oHG9GSqAXYuNgZ6VKUMshwBWLmsMLIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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