SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d0e5d21b75cfb5f4e90f162759122ab4372c3dacfbfaeaefd27a3104551086' 
  AND token = 'lhGmllkrOzV7npABzo/9I9hJnz5v/ZQPmX8oBCIAXo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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