SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95978e207f833143ac86777f16527ebac1342aa0ad3632c2adba11d59e358d2a' 
  AND token = 'HIZwb7nwzqeHQTCp68YKKQ8zLsakB+LjiFuXuboUUcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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