SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d0694cb8a2b21e9571e0529bf12557d6464077a6908f375e5f2b53e569da48' 
  AND token = 'YjFkS5/upmoRogl/cLzOuVZTtBSR4tCAGll7GpCHgOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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