SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ed85c0e4bae3cc9720990d621cc0e6feb0b5f7e536976d49bb9fa465174fb0' 
  AND token = 'RW4UCm3vjB/lO5f+SWIAXfqDlLmoYLqLBV3PqGHJLAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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