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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4defc5242bb66bc44e589dd333284249564453408e0dc55132e0b04a7c4688' 
  AND token = 'hzh1XToe+d+XGz4ZkyavVkrm5JmyDhK92I9exBp7UMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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