SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae77ba0e82607a247f7216a87e5fcecd036c398342bfe43dfd91f920bfd6f6e' 
  AND token = 'NwEAcX+FLBeIKvgX/WvKqWb45ZB/rs8qbA/34NYl5Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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